then

Начиная с Kotlin: 1.1

inline fun <T, S> Promise<Promise<T>>.then(noinline onFulfilled: (T) -> S?): Promise<S>

inline fun <T, S> Promise<Promise<T>>.then(noinline onFulfilled: (T) -> S?, noinline onRejected: (Throwable) -> S?): Promise<S>

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